学步园

__author__ = '375159507'
try:
    from PySide import QtCore
    from PySide import QtGui
except ImportError:
    from PyQt4 import QtGui
    from PyQt4 import GtCore

class RubberBand(QtGui.QMainWindow):
    def __init__(self):
        super(RubberBand,self).__init__()
        self.MainWidet = QtGui.QWidget()
        self.MainWidet.setBackgroundRole(QtGui.QPalette.Light)
        self.setWindowTitle("RubberBand")
        self.MainWidet.setAutoFillBackground(True)
        self.setCentralWidget(self.MainWidet)
        self.resize(600,400)
        self.first = True
    def mousePressEvent(self,e):
        self.origin = e.pos();
        if self.first:
            self.rubberband = QtGui.QRubberBand(QtGui.QRubberBand.Rectangle,self)
        self.rubberband.setGeometry(QtCore.QRect(self.origin,QtCore.QSize()))
        self.rubberband.show()
    def mouseMoveEvent(self, e):
        self.rubberband.setGeometry(QtCore.QRect(self.origin,e.pos()).normalized())
    def mouseReleaseEvent(self, e):
        if self.rubberband:
            self.rubberband.hide()

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    mainwindow = RubberBand()
    mainwindow.show()
    sys.exit(app.exec_())

程序效果图